Mercurial > 510Connectbot
annotate app/src/main/java/ch/ethz/ssh2/packets/TypesReader.java @ 507:f7498bd7621b
Added tag stable-1.9.4-5 for changeset b8cc360e1550
author | Carl Byington <carl@five-ten-sg.com> |
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date | Wed, 16 Nov 2022 12:07:04 -0700 |
parents | d29cce60f393 |
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1 /* |
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. |
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3 * Please refer to the LICENSE.txt for licensing details. |
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4 */ |
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5 package ch.ethz.ssh2.packets; |
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6 |
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7 import java.io.IOException; |
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8 import java.math.BigInteger; |
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9 |
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10 import ch.ethz.ssh2.PacketFormatException; |
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11 import ch.ethz.ssh2.util.StringEncoder; |
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12 |
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13 /** |
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14 * @author Christian Plattner |
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15 * @version $Id: TypesReader.java 160 2014-05-01 14:30:26Z dkocher@sudo.ch $ |
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16 */ |
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17 public final class TypesReader { |
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18 byte[] arr; |
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19 int pos = 0; |
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20 int max = 0; |
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21 |
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22 public TypesReader(byte[] arr) { |
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23 this.arr = arr; |
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24 pos = 0; |
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25 max = arr.length; |
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26 } |
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27 |
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28 public TypesReader(byte[] arr, int off) { |
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29 this.arr = arr; |
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30 this.pos = off; |
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31 this.max = arr.length; |
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32 |
307 | 33 if ((pos < 0) || (pos > arr.length)) { |
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34 throw new IllegalArgumentException("Illegal offset."); |
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35 } |
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36 } |
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37 |
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38 public TypesReader(byte[] arr, int off, int len) { |
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39 this.arr = arr; |
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40 this.pos = off; |
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41 this.max = off + len; |
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42 |
307 | 43 if ((pos < 0) || (pos > arr.length)) { |
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44 throw new IllegalArgumentException("Illegal offset."); |
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45 } |
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46 |
307 | 47 if ((max < 0) || (max > arr.length)) { |
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48 throw new IllegalArgumentException("Illegal length."); |
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49 } |
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50 } |
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51 |
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52 public int readByte() throws IOException { |
307 | 53 if (pos >= max) { |
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54 throw new PacketFormatException("Packet too short."); |
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55 } |
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56 |
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57 return (arr[pos++] & 0xff); |
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58 } |
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59 |
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60 public byte[] readBytes(int len) throws IOException { |
307 | 61 if ((pos + len) > max) { |
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62 throw new PacketFormatException("Packet too short."); |
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63 } |
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64 |
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65 byte[] res = new byte[len]; |
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66 System.arraycopy(arr, pos, res, 0, len); |
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67 pos += len; |
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68 return res; |
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69 } |
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70 |
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71 public void readBytes(byte[] dst, int off, int len) throws IOException { |
307 | 72 if ((pos + len) > max) { |
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73 throw new PacketFormatException("Packet too short."); |
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74 } |
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75 |
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76 System.arraycopy(arr, pos, dst, off, len); |
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77 pos += len; |
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78 } |
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79 |
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80 public boolean readBoolean() throws IOException { |
307 | 81 if (pos >= max) { |
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82 throw new PacketFormatException("Packet too short."); |
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83 } |
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84 |
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85 return (arr[pos++] != 0); |
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86 } |
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87 |
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88 public int readUINT32() throws IOException { |
307 | 89 if ((pos + 4) > max) { |
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90 throw new PacketFormatException("Packet too short."); |
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91 } |
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92 |
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93 return ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8) |
307 | 94 | (arr[pos++] & 0xff); |
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95 } |
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96 |
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97 public long readUINT64() throws IOException { |
307 | 98 if ((pos + 8) > max) { |
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99 throw new PacketFormatException("Packet too short."); |
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100 } |
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101 |
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102 long high = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8) |
307 | 103 | (arr[pos++] & 0xff); /* sign extension may take place - will be shifted away =) */ |
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104 long low = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8) |
307 | 105 | (arr[pos++] & 0xff); /* sign extension may take place - handle below */ |
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106 return (high << 32) | (low & 0xffffffffl); /* see Java language spec (15.22.1, 5.6.2) */ |
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107 } |
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108 |
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109 public BigInteger readMPINT() throws IOException { |
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110 BigInteger b; |
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111 byte raw[] = readByteString(); |
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112 |
307 | 113 if (raw.length == 0) { |
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114 b = BigInteger.ZERO; |
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115 } |
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116 else { |
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117 b = new BigInteger(raw); |
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118 } |
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119 |
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120 return b; |
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121 } |
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122 |
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123 public byte[] readByteString() throws IOException { |
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124 int len = readUINT32(); |
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125 |
307 | 126 if ((len + pos) > max) { |
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127 throw new PacketFormatException("Malformed SSH byte string."); |
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128 } |
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129 |
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130 byte[] res = new byte[len]; |
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131 System.arraycopy(arr, pos, res, 0, len); |
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132 pos += len; |
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133 return res; |
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134 } |
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135 |
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136 public String readString(String charsetName) throws IOException { |
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137 int len = readUINT32(); |
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138 |
307 | 139 if ((len + pos) > max) { |
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140 throw new PacketFormatException("Malformed SSH string."); |
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141 } |
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142 |
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143 String res = (charsetName == null) ? new String(arr, pos, len) : new String(arr, pos, len, charsetName); |
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144 pos += len; |
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145 return res; |
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146 } |
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147 |
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148 public String readString() throws IOException { |
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149 int len = readUINT32(); |
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150 |
307 | 151 if ((len + pos) > max) { |
273
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152 throw new PacketFormatException("Malformed SSH string."); |
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153 } |
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154 |
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155 String res = StringEncoder.GetString(arr, pos, len); |
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156 pos += len; |
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157 return res; |
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158 } |
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159 |
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160 public String[] readNameList() throws IOException { |
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161 return readString().split(","); |
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162 } |
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163 |
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164 public int remain() { |
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165 return max - pos; |
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166 } |
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167 |
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168 } |